Because the name is passed to c-ares as a C string, resolving attacker.example\0.trusted.example queries attacker.example and returns its records without any error. Applications that validate a hostname, for example against a domain allowlist, and then resolve it with dns.resolve*() can act on records for a different name than the one they validated.
This vulnerability affects Node.js 26.x, 24.x, and 22.x.
Analysis
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Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).
| Vendor | Product | Default status | Versions | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| nodejs | node | unaffected |
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Tracking
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Fri, 23 Oct 2026 17:45:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| Title | Node.js DNS Resolve Function Truncation Enables Hostname Validation Bypass |
Fri, 23 Oct 2026 16:30:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| Description | A flaw in Node.js DNS resolution allows hostnames containing a NUL byte to be silently truncated by the dns.resolve*() functions and dns.reverse(). This is an incomplete fix of CVE-2026-48930, which only covered dns.lookup() and the net/tls host options. Because the name is passed to c-ares as a C string, resolving attacker.example\0.trusted.example queries attacker.example and returns its records without any error. Applications that validate a hostname, for example against a domain allowlist, and then resolve it with dns.resolve*() can act on records for a different name than the one they validated. This vulnerability affects Node.js 26.x, 24.x, and 22.x. | |
| Weaknesses | CWE-284 | |
| References |
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| Metrics |
cvssV3_0
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Subscriptions
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MITRE
Status: PUBLISHED
Assigner: hackerone
Published:
Updated: 2026-10-23T16:15:05.831Z
Reserved: 2026-10-05T15:00:00.729Z
Link: CVE-2026-105482
Vulnrichment
No data.
NVD
Status : Received
Published: 2026-10-23T17:17:19.427
Modified: 2026-10-23T17:17:19.427
Link: CVE-2026-105482
Redhat
No data.
OpenCVE Enrichment
Updated: 2026-10-23T17:30:17Z